PC turns off suddenly when booting

Rainess · 12 Sep 2011

@TVeblen

That was really informative friend,
There's already a power switch on my mobo, and powering with it makes no difference, therefore the problem isn't there.
No POST beep here, however it shuts before anything appears on my screen.
Just note that I already updated my BIOS but nothing changed.

Well, logically it seems it's a PSU/Power Problem, anyway I'm gonna try later to boot without the GTX just to be sure.

@essenbe

I totally agree, I thought TT were Reliable and i needn't more than 450W.

GEWB · 12 Sep 2011

Before you spend money and tear into your rig, this has come up before - with some motherboards this is NORMAL (including mine).

One key you posted is "sometimes"...do you have a power strip on the PC? Do you sometimes turn off the power on the power supply?

I'll bet the Start-Stop-Restart happens when the power has been turned OFF, as in power strip switch turned off - then you turn power on and then turn computer on...it does the start-off-restart. BUT when you turn off the PC when exiting Windows but leave power to the PC turned ON, it fires right up.

Try it and see if that happens. If so, it is normal.

Regards,
GEWB

TVeblen · 12 Sep 2011

That reminds me...

You should also check your CMOS battery. When they get weak or go dead all kinds of strange boot problems can happen.

You can test with a multimeter for a solid 3.3v, or just try a replacement. They are relatively cheap as compared to a power supply.

GeneO · 12 Sep 2011

I would peruse the hardwaresecrets site. Their reviews of several Thermaltake power supplies conclude they stick a higher rating on the supply than it can deliver. For example:

Thermaltake TR2 RX 750 W Power Supply Review | Hardware Secrets

This may not be true for your specific model - they haven't reviewed it, but it seems to be for several of the TT supplies they have reviewed.

jumanji · 12 Sep 2011

The OP may also check all cables and connections inside. SATA cables getting loose over a period of time can cause boot problems.

Layback Bear · 13 Sep 2011

essenbe good post. That said, every thing in the computer starts with a great power supply. Trying to trouble shoot a computer with a maybe power supply is a waste of time......

Layback Bear · 13 Sep 2011

Cmos battery is another great idea. Thanks TVeblen.Test na they are cheep just put one in.I change mine once a year. Their may be more problems; but lets get the basics before going farther is my thoughts.

Rainess · 13 Sep 2011

Here's some updates;
Today, booted 4 times without the GTX and everything went okay.
even though i replugged the GTX and PC booted normally, well the problem is not continuous as I stated so that didn't help.

@GEWB
Actually, I tried that yesterday but no luck.

@TVeblen
My Mobo is still new anyway I'll try that later.

Many thanks everyone.